INFEASIBLE

ab ae ai al an as ba be bi ef el en es fa fe if in is la li na ne si

abs ail ain ais alb ale als ane ani bal ban bas bee bel ben bes bin bis eel efs elf els ens fab fan fas fee fen fes fib fie fil fin ifs ins lab las lea lee lei les lib lie lin lis nab nae neb nee nib nil sab sae sal sea see sei sel sen sib sin

able ails ains albs alee alef ales alif anes anil anis bail bale bals bane bani bans base bean beef been bees bels bene bens bias bile bine bins bise blae blin ease eels elan else esne fabs fail fain fane fans feal feeb feel fees fens fibs fila file fils fine fins flab flan flea flee ibis ilea ilia inia isba isle labs lain lane lase leaf lean leas lees leis lens libs lief lien lies life line lins nabe nabs naif nail nebs neif nibs nils nisi sabe safe sail sain sale sane seal seel seen seif self sene sial sine slab snib